replace userId by groupId in logs

src/Application/Actions/Group/ViewGroupAction.php

@@ -19,7 +19,7 @@ class ViewGroupAction extends GroupAction
         if (!isset($group)) {
             throw new GroupNotFoundException();
         }
-        $this->logger->info("group of id `${userId}` was viewed.");
+        $this->logger->info("group of id `${groupId}` was viewed.");
 
         return $this->twig->render($this->response, "/group/group_view.twig", ["group" => $group, "session" => $_SESSION]);
     }